Pertaining to a theoretically mentally disabled girl, who is not actually diagnosed with a mental disorder, but acts like it, whom cannot for whatever reason obtain a license, and who might run into something oblivious while driving without a license. i.e. a garage.
That girl is such a stoop-muffin, I wonder what happened to her.
ME: Wow, did you see that car crash?
ME: Thats because she crashed into a garage... what a stoop-muffin..